Plastic composition



Patented Sept. 12, I933 No Drawing." Application Jul i Serial No. 555L800,

present invention relates to an improved comparatively light inweight, andwhich possesses the qualities 'whereby it adheres closely and firmly to lath, brick' or tile, concrete or cement surfaceaas well as to wood, plaster boards,

and various other formsof building construction andmaterials that require plastering. c

ing qualitiesin the composition. A further ,ob jection to the usual plaster wall isits-tendency 'to crack and check as the building structure or material to which the plaster is applied, settles, or shrinks, Y

The plastencomposition of myinvention islof such consistency and bodythat it willnot check nor'crack while drying,wand the plaster expands and contracts with similar changes in the material to which it is applied. 'By applying the plaster of my invention to a building wall the latter is rendered soundproof, and provides a heat insulation that prevents transmission of heat,.as well as of moisture My improved plaster may be trowelled on a.- wall' to a smoothfinish, and this finished wall may receive paint, oil, enamel, tints or stains,

or the wall surfaces thus prepared may be covered with the usual wall paper &c. In preparing my improved plaster I employ ma- .terials that are inexpensive in cost and'readily 35 obtainable, and I provide a wall'plaster. that is durable, light in weightbut strong, andwhichin its plastic condition may with facility be trow-' elled upon the surface to be plastered.

In carrying. out my invention I utilize the following ingredients in approximately the stated proportions, by weight:-

Parts Clay 6 ,Paper pu1p l i 2 Sawdust 1 These ingredients are mixed with water to form a plaster of the proper plasticity or con sistency, and while the above formula has produced a very satisfactory plaster, it will be understood that the proportions may be varied within limits, and I therefore do not confine myself to these exact porportions. V The clay employed may be of any suitable commaterialadds strength'and body toithe f S'P Q As is well known, the usual hard wall plaster sets quickly, and checks and cracks, especially 1 at cornersand turns, because of the lack of bonddustin the mixing'machine, and'the fibrous maclays vary in, color, colored clays may be used with color eifects where desiredxin the plaster, or

if required, suitablecoloring materialor agents The sawdust, obtained; as, waste material from saw mills and from. different kinds ofxwood, is incorporated asv a. filler for; the fin ished com' position, and in' addition the sawdust provides an agency,lduring the process: of preparing the "7 1 composition, that renders the mixture more friable and suitable for carrying out pne of the steps in the process of'malging the plaster composition. In carrying out the steps in the process of makingthe plaster composition ofmyinvention, 7'

the clay and sawdust are supplied to a hopper, which feeds these materials in proper propor- I tions to amixing machine, which also acts'as abeater, and which contains water in required quantity for the mixing operation, and during. this operation the clay and sawdust are ground or mixed together and closely; commingled. a

The fibrous" material, in the form, of stock,

sheets, and other forms of waste paper is also; 7

incorporated and" mixed with the clay and saw terial, of course is fed to the mixer in proper proportions withrelation to the other ingredients of the composition,

The mixing machine may be in the nature of i a beating-machine, whichfireduces the paper sheets or'paper stock to fine fibers, and at the same time thoroughly incorporates the clay, saw-,

dust and'fibrouspaper pulp into a mass of finely, comminuted materials. Thus the three ingredi-1 1 ents', in water, are reduced, beaten, a'nd'thoroughly commingled to form a plaster pulp or plastic composition, and at suitable intervals the mass is run or flowed from the mixing' machine into a suitable receptacle.

" By means of a pump, or mother suitable .man-

ner, the watery pulp is next conveyed to a grinding' apparatus, which may comprise burr-stones between which the mixture is ground toreduce the commingled parts to an extreme fineness, and to thoroughly and uniformly incorporate the ingredientsiinto a moist mass.

This moist mass, of which the solids have been finely comminuted, is next conveyed to a dehy drating apparatus or press, in which. the major portion of the moisture is extracted and drained off, and the water content is materially reduced,

and fibrous binder are uniformly distributed and adhesively incorporated, and swhich is friable. To prepare the plastic composition for shipping, storing,"and commercialpurposes, the corngeneous particles in the nature of a fibrous powder, and the presence of the sawdust filler in the mixture insures that the composition will breaki up in this manner thereby permitting easy.han-- dling of the composition.

For breaking up and crumbling the. ,composi- 1 tion it is passed through a suitable grinding machine wherein the composition'is broken up into small particles in the nature of a fibrous" pbwder that is soft and smooth to the touch; ands which is porous and absorbent, and readily ban-V died for packingin bags or sacks for storing and shipping purposes.

When the composition is to be used asa plaster, the fibrous-powdery material or composition is placed'in-za" suitable' receptacle and water in required quantities -is' added thereto,- agitated or stirred and tlioroug'hly'mixed to form the plastic composition or plaster ofproperconsistency, and

this plastic composition may-readily be -trowelledon a wall'surface, orapplied-by'other suite 1 able tools orimplementsto the wall.

tivelythin layer of the plasticcomposition maybejeinploye'd, and as the'compositionis light'in weight a minimum load-isi'inposed'on the wall structure to which: the composition 'isfapplied;

--'l';hus{the plastermay-be applied'in a compara- *tively thin coat (many of the usual'wall-boards,

Asbefore stated, H "maybe finished or smoothed for a'finished. ex-

' I 'claim'as new and or to a plastered wall of usual structure, to rein der such structures sound-proof. After the com?- position has dried and set its surface is com paratively soft and yielding to the touch, but the body of the coating istough, firm and durable,

. and the material is capable of expansion and contraction so that it fmay come and go with Because of the fibrous binder in the composition, the plastered wall is free from cracks or crumbling, and the surface of the plastered wall isdustless. T v

the face of the plastered wall posure', or .the surface may-be ornamented by paintingtinting, staining 850., or if desired, the surface may be covered with wallpaper in the '1 usual manner. In any event, the range of expansion and contraction of thecomposition is such that the plastered wall will adaptitself to all conditions of this character inherentin the foundation to-.-which the plaster is app1ied;"and there fore -"checking, eliminated; 7 a

' Theco'mpositio is'especially valuable for use in" theatres, and" other public places because of its acoustic properties; and it may readily be applied as' a-cioating for-the usual plastered walls (to improve their'a coustic properties.

Having thus 'fully described my invention, what Patent; is:

I changes in the structure to which it .isfapplied; position-is broken up or crumbled into fine homodesire to secure by Letters cracking, and crumbling are which consists in mixingclay, sawdust and fibrous paper in: water, finely grinding the mixturein water, extra'cting the water from the mixture, pulverizing the dehydrated mixture, and adding water to bring the pulverized composition to a proper degree of plasticity for use."

JAMES 'KEETH. 

